linux-kernel - Re: [RFC][PATCH 14/18 v2] ftrace/lockdep: Have the RCU lockdep splat show what function triggered

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Date:	Fri, 6 Sep 2013 14:57:19 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [RFC][PATCH 14/18 v2] ftrace/lockdep: Have the RCU lockdep splat
 show what function triggered


* Steven Rostedt <rostedt@...dmis.org> wrote:

> On Thu, 5 Sep 2013 21:18:39 +0200
> Peter Zijlstra <peterz@...radead.org> wrote:
> 
> > On Sat, Aug 31, 2013 at 01:11:31AM -0400, Steven Rostedt wrote:
> > > +void print_ftrace_rcu_func(int cpu)
> > > +{
> > > +	unsigned long ip = per_cpu(ftrace_rcu_func, cpu);
> > > +
> > > +	if (ip)
> > > +		printk("ftrace_rcu_func: %pS\n",
> > > +		       (void *)per_cpu(ftrace_rcu_func, cpu));
> > > +}
> > 
> > That's missing { }.
> 
> Hmm, that's an interesting point. Why the  { } because I break up the
> printk for the 80 character limit?

You probably shouldn't break it up - it looks uglier.

> Although, I'm still not convinced that it needs { }, as it looks to me 
> that it flows nicely without it. I can't find a place in CodingStyle 
> that says { } are needed here.

it's somewhat of a grey area - the section quoted below talks about it 
broadly - and it's typically understood to apply to multi-line statements 
as well, as it's easy to overlook and confuse multi-statements with 
multi-line statements...

Thanks,

	Ingo

----------------------->

Do not unnecessarily use braces where a single statement will do.

if (condition)
        action();

and

if (condition)
        do_this();
else
        do_that();

This does not apply if only one branch of a conditional statement is a 
single statement; in the latter case use braces in both branches:

if (condition) {
        do_this();
        do_that();
} else {
        otherwise();
}

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